## CryptoDB

### Paper: Fast Lattice Basis Reduction Suitable for Massive Parallelization and Its Application to the Shortest Vector Problem

Authors: Tadanori Teruya Kenji Kashiwabara Goichiro Hanaoka DOI: 10.1007/978-3-319-76578-5_15 Search ePrint Search Google PKC 2018 The hardness of the shortest vector problem for lattices is a fundamental assumption underpinning the security of many lattice-based cryptosystems, and therefore, it is important to evaluate its difficulty. Here, recent advances in studying the hardness of problems in large-scale lattice computing have pointed to need to study the design and methodology for exploiting the performance of massive parallel computing environments. In this paper, we propose a lattice basis reduction algorithm suitable for massive parallelization. Our parallelization strategy is an extension of the Fukase–Kashiwabara algorithm (J. Information Processing, Vol. 23, No. 1, 2015). In our algorithm, given a lattice basis as input, variants of the lattice basis are generated, and then each process reduces its lattice basis; at this time, the processes cooperate and share auxiliary information with each other to accelerate lattice basis reduction. In addition, we propose a new strategy based on our evaluation function of a lattice basis in order to decrease the sum of squared lengths of orthogonal basis vectors. We applied our algorithm to problem instances from the SVP Challenge. We solved a 150-dimension problem instance in about 394 days by using large clusters, and we also solved problem instances of dimensions 134, 138, 140, 142, 144, 146, and 148. Since the previous world record is the problem of dimension 132, these results demonstrate the effectiveness of our proposal.
##### BibTeX
@inproceedings{pkc-2018-28873,
title={Fast Lattice Basis Reduction Suitable for Massive Parallelization and Its Application to the Shortest Vector Problem},
booktitle={Public-Key Cryptography – PKC 2018},
series={Public-Key Cryptography – PKC 2018},
publisher={Springer},
volume={10769},
pages={437-460},
doi={10.1007/978-3-319-76578-5_15},
author={Tadanori Teruya and Kenji Kashiwabara and Goichiro Hanaoka},
year=2018
}